EP1465738B1 - Verfahren und vorrichtung zum beschichten beider seiten einer bahn - Google Patents

Verfahren und vorrichtung zum beschichten beider seiten einer bahn Download PDF

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Publication number
EP1465738B1
EP1465738B1 EP02764905A EP02764905A EP1465738B1 EP 1465738 B1 EP1465738 B1 EP 1465738B1 EP 02764905 A EP02764905 A EP 02764905A EP 02764905 A EP02764905 A EP 02764905A EP 1465738 B1 EP1465738 B1 EP 1465738B1
Authority
EP
European Patent Office
Prior art keywords
web
coating
devices
travel
coating slip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02764905A
Other languages
English (en)
French (fr)
Other versions
EP1465738A1 (de
Inventor
Pauli Kytönen
Seppo Luomi
Petri Paloviita
Pentti Rautiainen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1465738A1 publication Critical patent/EP1465738A1/de
Application granted granted Critical
Publication of EP1465738B1 publication Critical patent/EP1465738B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • D21H23/72—Plural serial stages only

Definitions

  • the invention concerns a method for two-sided coating of a moving paper or board web according to the preamble of claim 1.
  • the invention also concerns an equipment for coating a moving paper or board web according to the preamble of claim 6 and including devices for applying a coating slip to a first surface of the web, devices for applying a coating slip to a second surface of the web as well as devices for drying the web, which has been coated on both sides.
  • curtain coating In curtain coating, the coating slip is applied to the surface of the moving paper or board web from a nozzle gap located above the web transversely to the web's direction of travel, from which gap the coating slip falls on to the web surface as a curtain-like shower.
  • Curtain coating is a contact-free coating method, wherein after the spreading of the coating slip no force is applied to the paper web in order to control the quantity of coating remaining on the web surface. For this reason, there are less breaks caused by breaking of the paper web and runnability is better than, for example, in a blade-coating method. With curtain coating a better coverage is achieved than with blade coating, but the smoothness of the coated surface is not so good.
  • the curtain-coating beam Since the method utilises gravity, the curtain-coating beam must always be located above the web to be coated. This makes it impossible to coat both sides of the paper or board web at the same time.
  • a normal procedure in one-sided coating is first to coat the first side of the web, dry the web completely, turn it upside down, coat the second side and dry the coated web once again. This requires long web transfers between two coating points as well as two complete sets of drying equipment.
  • US -A-4 455 327 describes a method for two-sided coating, wherein the first side of the web is coated by using some coating method known as such and the second side of the web is coated using a coating method based on a freely falling curtain.
  • US-A-5 122 386 shows a generic method for two-sided coating of a moving paper or board web according to the preamble of claim 1 and a generic equipment for coating a moving paper or board web according to the preamble of claim 6.
  • the method according to the invention is characterised by the features presented in claim 1.
  • the equipment according to the invention is characterised by the features presented in claim 6.
  • the coating method according to the invention includes following steps, wherein
  • the web's direction of travel may be turned once again in the step where both sides of the web have been coated.
  • a turning roll or contact-free turning device is used as the turning equipment.
  • the web may also be dried without contact in connection with the turning equipment.
  • the gravity-based method for application of the coating slip may be curtain coating, coating of the MicroJet type, which is described in patent application FI 991498 , or some other coating method working essentially in such a way that the application equipment must be located above the web.
  • MicroJet coating the coating slip is directed through holes in the nozzle plate towards the surface of the moving web.
  • One-sided coating can typically be performed on both sides of the web without any complete drying in between and without long transfers. Savings result due, among other things, to the fact that only one piece of drying equipment is needed and the coating machine is essentially shorter. Threading is short and free draws of the web are short, which improves the runnability of the machine.
  • FIG. 1 the following is a study of the traditional way of performing coating of the web from one side at a time using curtain coating.
  • a layout of a similar type is used e.g. in blade coating, which typically is a one-sided coating method.
  • the paper web W is guided to travel under a first curtain-coating beam 11, from which an even layer of coating slip is applied to the upper surface S A of the moving web W as a freely falling curtain.
  • the coated side S A of the web is first dried without contact by an infra-drying equipment 12 and then both sides of the web are dried without contact by an air-drying equipment 13.
  • the drying is finished as contact drying using steam-drying cylinders 14.
  • the web W is then transported guided by guiding rolls 15 over a relatively long distance to turn it the other way round, in order to allow coating of the other side S B of the web.
  • a second curtain-coating beam 16 is located, which is followed by an infra-drying equipment 17 to dry the coated surface S B . Following then arean air-drying equipment 18 and drying cylinders 19 for two-side drying of the web.
  • the coated web W is moved further guided by guiding rolls 20 to a reel-up 21.
  • Figure 2 illustrates how much the length of the coating machine is reduced by the way according to the invention of coating both sides of the web almost simultaneously. Partly the same reference numbers as in Figure 1 are used for parts corresponding to each other.
  • a coating slip is applied using a first curtain-coating beam 11, and the coated side is dried without contact using the infra-drying equipment 12. Then the travelling direction of the web W is changed with the aid of two successive turning rolls 22 so much that after the change of direction the web will travel obliquely downwards towards the incoming direction of the web W.
  • a layer of coating slip is applied to the second surface S B of web W by the second curtain-coating beam 16, which is fitted above the web W on its run travelling obliquely downwards.
  • the web's direction of travel is again changed with the aid of two contact-free turning devices 23 and 24, whereby in the area remaining in between these devices the web's surface S B , which was coated last, is dried by the infra-drying equipment 17. Then the completely coated web W is dried with the aid of the air-drying equipment 13 and the steam-drying cylinders 14.
  • Figure 3 shows the principle of the curtain-coating equipment according to the invention, wherein the direction of travel of the web W to be coated is from above left down to the right and wherein the web's W direction of travel is turned around twice.
  • the first curtain-coating beam 11 Above the first run of the web the first curtain-coating beam 11 is located, from which a layer of coating slip is dropped as a uniform curtain on to the first surface S A of web W.
  • the web's W direction of travel is changed with the aid of one or more turning rolls 22 by 120 - 200° in such a way that after the turning roll 22 the web W will travel obliquely downwards towards its incoming direction.
  • the second curtain-coating beam 16 is located above the web W and from this beam a layer of coating slip falls as a uniform curtain on to the second surface S B of web W.
  • the direction of travel of the web W which has now been coated on both sides, is changed for a second time with the aid of the contact-free turning device 23 in such a way that the web W will once again travel in its original direction.
  • the turning device 23 may be e.g. a TurnFloat turning device made by the applicant, wherein an air flow is blown against the web's W coated surface S A .
  • an air cushion is formed between the web W and the turning device 23 to keep the moist and coated web W separate from the surface of the turning device 23.
  • the web is guided into the air-drying device 13, wherein both sides of the coated web W are dried at the same time.
  • Figure 4 shows a solution, wherein the web's W coated surfaces S A , S B are dried without contact in connection with the change in the direction of travel of the web.
  • the turning roll 22 following after coating of the first side S A it is possible to use e.g. an air impingement drier 25.
  • both surfaces S A , S B of the web are wet, for which reason it is advantageous for the turning to use a turning-and-drying device 26 drying the web without contact on both sides, which device 26 is e.g. the turning-and-drying device made by the applicant under the product name TumDry.
  • Figure 5 shows a solution, wherein after the first curtain-coating beam 11 a first turning device 27 is used to turn the web W upwards to travel obliquely upwards towards the web's W incoming direction.
  • a first turning device 27 is used to turn the web W upwards to travel obliquely upwards towards the web's W incoming direction.
  • the second curtain-coating beam 16 is located above the web, whereupon the web's W direction of travel is changed with the aid of a second turning device 28 in such a way that it will once again travel in its original outgoing direction.
  • curtain-coating beam there may be some other gravity-based coating device, such as, for example, a MicroJet beam, which is located above the web and where the coating is brought to the web from a distribution chamber through a sieve in the form of small jets, which merge on the web forming a coherent coating surface.
  • a MicroJet beam which is located above the web and where the coating is brought to the web from a distribution chamber through a sieve in the form of small jets, which merge on the web forming a coherent coating surface.
  • Figures 2 - 5 show such a form of application only, wherein the web's direction of travel is turned twice by 120 -200°, it is possible to embody the invention also in such a way that the web's direction of travel is changed only once.

Claims (9)

  1. Verfahren zum beidseitigen Streichen einer sich bewegenden Papier- oder Kartonbahn (W), wobei das Verfahren die folgenden Schritte aufweist:
    a) Aufbringen einer Streichmasse auf eine erste Fläche (SA) der Bahn (W) mit Hilfe der Schwerkraft als ein frei fallender Vorhang oder Schauer,
    b) Drehen der Wegrichtung der Bahn (W) um 120 - 200°, und
    c) Aufbringen einer Streichmasse auf eine zweite Fläche (SB) der Bahn (W) mit Hilfe der Schwerkraft als ein frei fallender Vorhang oder Schauer,
    gekennzeichnet durch
    d) gleichzeitiges Trocknen beider Seiten (SA, SB) der gestrichenen Bahn.
  2. Streichverfahren nach Anspruch 1, dadurch gekennzeichnet, dass nach dem Schritt c) die Wegrichtung der Bahn ein zweites Mal um 120 - 200° gedreht wird.
  3. Streichverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass, wenn die Wegrichtung der Bahn gedreht wird, gleichzeitig die Bahn (W) berührungsfrei getrocknet wird.
  4. Streichverfahren nach einem vorangehenden Anspruch, dadurch gekennzeichnet, dass ein Vorhangstreichbalken (11, 16) verwendet wird, um die Streichmasse auf die Bahnfläche (SA, SB) aufzubringen.
  5. Streichverfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass zum Aufbringen der Streichmasse auf die Bahnfläche (SA, SB) ein Aufbringungsbalken verwendet wird, der oberhalb der Bahn (W) angeordnet ist und aus dessen Löchern die Streichmasse auf die zu streichende Fläche (SA, SB) ausgestoßen wird.
  6. Anlage zum Streichen einer sich bewegenden Papier-oder Kartonbahn (W), wobei die Anlage Vorrichtungen (11) zum Aufbringen einer Streichmasse auf eine erste Fläche (SA) der Bahn (W), Vorrichtungen (16) zum Aufbringen einer Streichmasse auf eine zweite Fläche (SB) der Bahn (W) sowie Vorrichtungen (13, 14) zum Trocknen der Bahn (W) aufweist, wobei
    - die Vorrichtungen (11) zum Aufbringen der Streichmasse auf die erste Fläche (SA) der Bahn (W) einen Aufbringungsbalken (11) aufweisen, der oberhalb der Bahn (W) angeordnet ist und der einen Zufuhrspalt oder Zufuhrlöcher zum Ausstoßen der Streichmasse mit Hilfe der Schwerkraft als ein frei fallender Vorhang oder Schauer auf die zu streichende Fläche (SA) hat,
    - die Vorrichtungen (16) zum Aufbringen der Streichmasse auf die zweite Fläche (SB) der Bahn (W) einen Aufbringungsbalken (16) aufweisen, der oberhalb der Bahn (W) angeordnet ist und der einen Zufuhrspalt oder Zufuhrlöcher zum Ausstoßen der Streichmasse mit Hilfe der Schwerkraft als ein frei fallender Vorhang oder Schauer auf die zu streichende Fläche (SB) hat, und
    - in dem Verlauf der Bahn (W) zwischen den Aufbringungsbalken (11, 16) Wendevorrichtungen (22) vorhanden sind, um die Wegrichtung der Bahn (W) um 120 - 200° zu verändern, nachdem die Streichmasse auf die erste Fläche (SA) der Bahn (W) aufgebracht wurde,
    dadurch gekennzeichnet, dass
    die Vorrichtungen (13, 14) zum Trocknen der Bahn (W) in Bezug auf die Vorrichtungen (11, 16) zum Aufbringen der Streichmassen auf beide Seiten der Bahn (W) in der Wegrichtung der Bahn (W) bahnabwärtig angeordnet sind, um beide Seiten (SA, SB) der gestrichenen Bahn (W) gleichzeitig zu trocknen.
  7. Anlage nach Anspruch 6, dadurch gekennzeichnet, dass die Anlage ferner Vorrichtungen (23, 24) zum Verändern der Wegrichtung der Bahn (W) um 120 - 200° aufweist, nachdem die Streichmasse auch auf die zweite Fläche (SB) der Bahn (W) aufgebracht wurde.
  8. Anlage nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Vorrichtungen (23, 24), die die Wegrichtung der Bahn (W) verändern, mit Trocknungsvorrichtungen (25, 26) kombiniert sind, um ein berührungsloses Trocknen von einer oder von beiden gestrichenen Flächen (SA, SB) der Bahn (W) zu ermöglichen.
  9. Anlage nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die Vorrichtungen (11, 16) zum Aufbringen der Streichmasse auf die Bahnfläche (SA, SB) einen Vorhangstreichbalken (11, 16) aufweisen.
EP02764905A 2001-10-08 2002-10-03 Verfahren und vorrichtung zum beschichten beider seiten einer bahn Expired - Lifetime EP1465738B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20011953 2001-10-08
FI20011953A FI20011953A0 (fi) 2001-10-08 2001-10-08 Menetelmä ja laitteisto liikkuvan rainan päällystämiseksi
PCT/FI2002/000778 WO2003031080A1 (en) 2001-10-08 2002-10-03 Method and apparatus for coating both sides of a web

Publications (2)

Publication Number Publication Date
EP1465738A1 EP1465738A1 (de) 2004-10-13
EP1465738B1 true EP1465738B1 (de) 2008-11-26

Family

ID=8562013

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02764905A Expired - Lifetime EP1465738B1 (de) 2001-10-08 2002-10-03 Verfahren und vorrichtung zum beschichten beider seiten einer bahn

Country Status (8)

Country Link
US (1) US20050008785A1 (de)
EP (1) EP1465738B1 (de)
JP (1) JP2005504898A (de)
AT (1) ATE415207T1 (de)
CA (1) CA2463160C (de)
DE (1) DE60230063D1 (de)
FI (1) FI20011953A0 (de)
WO (1) WO2003031080A1 (de)

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DE20221952U1 (de) * 2002-06-24 2009-08-20 Voith Patent Gmbh Vorrichtung zum beidseitigen Streichen und zum Trocknen einer Materialbahn, insbesondere aus Papier oder Karton
US7563326B2 (en) 2002-06-24 2009-07-21 Voith Paper Patent Gmbh Device for coating and drying both sides of a material web of paper or board
DE10349122A1 (de) * 2003-10-22 2005-05-25 Voith Paper Patent Gmbh Maschine zum Auftragen eines flüssigen oder pastösen Auftragsmediums auf die beiden Oberflächen einer laufenden Materialbahn
JP2005161152A (ja) * 2003-12-01 2005-06-23 Voith Paper Patent Gmbh 塗工装置
DE102004045172A1 (de) * 2004-09-17 2006-03-23 Basf Ag Verfahren zur Herstellung von ein- oder mehrfach gestrichenen Substraten mit einer ein Bindemittel vor Haftung umfassenden Streichfarbenzusammensetzung
US20090321001A1 (en) * 2008-06-26 2009-12-31 Seaman Corporation One-pass direct double lamination apparatus and process
JP6736247B2 (ja) * 2013-03-28 2020-08-05 日本製紙株式会社 塗工白板紙およびその製造方法
KR101430253B1 (ko) 2014-05-08 2014-09-23 (주)하나 스플릿레더의 양면 코팅방법 및 이를 위한 코팅장치
CN107159525B (zh) * 2017-07-11 2019-02-19 广东华丽宝实业有限公司 一种保护膜生产线用双面涂布收卷装置
CN109692787A (zh) * 2019-02-26 2019-04-30 浙江瑞旭汽车零部件有限公司 滤材双面施胶装置
CN110644285A (zh) * 2019-09-19 2020-01-03 上海影佳实业发展有限公司 一种纸张表面涂覆聚乙烯醇装置
KR102403955B1 (ko) * 2021-02-04 2022-06-03 박한수 웹종이 코팅장치
KR102358580B1 (ko) * 2021-10-08 2022-02-09 에이치비페이퍼 주식회사 웹종이 코팅장치
KR102382849B1 (ko) * 2021-10-08 2022-04-11 에이치비페이퍼 주식회사 웹종이 코팅장치

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GB1295536A (de) * 1970-04-03 1972-11-08
JPS6057385B2 (ja) * 1977-03-22 1985-12-14 富士写真フイルム株式会社 両面塗布方法
US4209584A (en) * 1979-06-15 1980-06-24 Eastman Kodak Company Manufacture of photographic elements having anticurl and antistatic layers
US5136966A (en) * 1988-10-28 1992-08-11 Konica Corporation Web coating apparatus
JPH02293072A (ja) 1989-05-01 1990-12-04 Fuji Photo Film Co Ltd 両面塗布方法
DE4416399C2 (de) * 1994-05-09 1999-04-01 Voith Gmbh J M Trocknungsvorrichtung für eine laufende Materialbahn
DE19823740A1 (de) * 1998-05-08 1999-11-11 Voith Sulzer Papiertech Patent Auftragsverfahren und -vorrichtung für eine Papier- oder Kartonbahn
FI108993B (fi) 1999-06-30 2002-05-15 Metso Paper Inc Menetelmä ja sovitelma käsittelyaineen levittämiseksi liikkuvalle pinnalle

Also Published As

Publication number Publication date
FI20011953A0 (fi) 2001-10-08
CA2463160C (en) 2009-06-30
CA2463160A1 (en) 2003-04-17
EP1465738A1 (de) 2004-10-13
US20050008785A1 (en) 2005-01-13
DE60230063D1 (de) 2009-01-08
JP2005504898A (ja) 2005-02-17
WO2003031080A1 (en) 2003-04-17
ATE415207T1 (de) 2008-12-15

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